Abstract
Hydrophone array-based distributed feedback fiber laser (DFB FL) has a small size and large sensitivity; however, it also suffers from intensity noise completely. In this letter, a transfer function for intensity noise propagation through the use of a DFB FL sensor interrogation system is derived, basing on which a symmetric algorithm using $3\times 3$ coupler is improved. Both experimental and simulation data are provided to validate the model. A noise reduction of 20 dB is achieved.
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